An expanse of heads nodded rhythmically until a galloping accelerando brought the audience to their feet.
From the time.com
Know your rallentando from your accelerando?
From the npr.org
Rallentando is the opposite of accelerando.
From the npr.org
Tape recorder in hand, he simply camps at the seashore or in a rain forest, and lets Mother Nature herself compose an accelerando of breaking waves or a pizzicato polka of storm effects.
From the time.com
More examples
Gradually increasing in tempo
With increasing speed; "here you must play accelerando"
Accelerando is a 2005 science fiction novel consisting of a series of interconnected short stories by British author Charles Stross. ...
A tempo mark directing that a passage is to be played at an increasing speed; A passage having this mark; describing a passage having this mark; with a gradual increase in speed
Speeding up (abbreviation: accel.)
Italian tempo marking meaning to gradually accelerate or speed up.
The new renaissance at the end of the 22nd century. Main article.
Getting faster as the section of the piece marked goes on.